Example of thread switching during invocation processing
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10:13:26,351 INFO  [org.wildfly.naming] (main) WildFly Naming version (unknown)
10:13:26,378 INFO  [org.jboss.ejb.client] (main) JBoss EJB Client version 4.0.47.Final
10:13:26,390 INFO  [org.jboss.as.test.clustering.cluster.AbstractClusteringTestCase] (main) begin txn: type = org.wildfly.transaction.client.RemoteUserTransaction, status = 0, thread = Thread[main,5,main]
10:13:26,390 INFO  [org.jboss.as.test.clustering.cluster.AbstractClusteringTestCase] (main) check txn: type = org.wildfly.transaction.client.RemoteTransaction, status = 0, thread = Thread[main,5,main]
10:13:26,447 INFO  [org.jboss.ejb.client.invocation] (main) TransactionEJBClientInterceptor: Calling  handleSessionCreation: context transaction = null
10:13:26,447 INFO  [org.jboss.ejb.client.invocation] (main) TransactionEJBClientInterceptor: Calling  handleSessionCreation: setting context transaction to caller transaction: caller transaction = Remote transaction org.wildfly.transaction.client.RemoteTransaction$Unlocated@144440f5
// calling thread
10:13:26,451 INFO  [org.wildfly.httpclient.ejb] (main) HttpEJBReceiver: createSession - thread = main
// 1. get backend server
10:13:26,468 INFO  [org.wildfly.httpclient.common] (main) HttpTargetContext: sendRequest - thread = main
10:13:26,470 INFO  [org.wildfly.httpclient.common] (main) HttpConnectionPool: getConnection - thread = main
10:13:26,471 INFO  [org.wildfly.httpclient.common] (main) HttpConnectionPool: runPending - thread = main
10:13:26,480 INFO  [org.wildfly.httpclient.common] (main) HttpTargetContext: sedRequestInternal - thread = main
10:13:26,488 INFO  [org.wildfly.httpclient.common] (main) HttpTargetContext: clientSendCallback:completed - thread = main
// change thread on receive 
10:13:26,509 INFO  [org.wildfly.httpclient.common] (XNIO-1 I/O-1) HttpTargetContext: clientReceiveCallback:completed - thread = XNIO-1 I/O-1
10:13:26,510 INFO  [org.wildfly.httpclient.common] (XNIO-1 task-3) HttpConnectionPool: returnConnection - thread = XNIO-1 task-3
10:13:26,511 INFO  [org.wildfly.httpclient.common] (XNIO-1 task-3) HttpConnectionPool: runPending - thread = XNIO-1 task-3
10:13:26,515 INFO  [org.wildfly.httpclient.common] (XNIO-1 task-3) HttpConnectionPool: getConnection - thread = XNIO-1 task-3
10:13:26,515 INFO  [org.wildfly.httpclient.common] (XNIO-1 task-3) HttpConnectionPool: runPending - thread = XNIO-1 task-3
// use receiver thread for sending next request
10:13:26,516 INFO  [org.wildfly.httpclient.common] (XNIO-1 task-3) HttpTargetContext: sedRequestInternal - thread = XNIO-1 task-3
10:13:26,516 INFO  [org.wildfly.httpclient.common] (XNIO-1 task-3) HttpTargetContext: clientSendCallback:completed - thread = XNIO-1 task-3
10:13:26,540 INFO  [org.wildfly.httpclient.common] (XNIO-1 I/O-1) HttpTargetContext: clientReceiveCallback:completed - thread = XNIO-1 I/O-1
10:13:26,542 INFO  [org.wildfly.httpclient.ejb] (main) HttpEJBReceiver: Got backend server URI: http://localhost:8180?name=node-2
10:13:26,542 INFO  [org.wildfly.httpclient.ejb] (main) HttpEJBReceiver: Using backend server: node-2
10:13:26,542 INFO  [org.wildfly.httpclient.common] (XNIO-1 task-3) HttpConnectionPool: returnConnection - thread = XNIO-1 task-3
10:13:26,542 INFO  [org.wildfly.httpclient.common] (XNIO-1 task-3) HttpConnectionPool: runPending - thread = XNIO-1 task-3
// 2. send session creation request
10:13:26,545 INFO  [org.wildfly.httpclient.common] (main) HttpTargetContext: sendRequest - thread = main
10:13:26,545 INFO  [org.wildfly.httpclient.common] (main) HttpConnectionPool: getConnection - thread = main
10:13:26,545 INFO  [org.wildfly.httpclient.common] (main) HttpConnectionPool: runPending - thread = main
10:13:26,545 INFO  [org.wildfly.httpclient.common] (main) HttpTargetContext: sedRequestInternal - thread = main
10:13:26,546 INFO  [org.wildfly.httpclient.common] (main) HttpTargetContext: clientSendCallback:completed - thread = main
10:13:26,546 INFO  [org.wildfly.httpclient.ejb] (main) HttpEJBReceiver: SessionCreationStickinesshandler.prepareREquest - thread = main
10:13:26,546 INFO  [org.wildfly.httpclient.ejb] (main) SessionCreationStickinessHandler: calling SessionCreationStickinessHandler.prepareRequest for request ClientRequest{path='/wildfly-services/ejb/v2//open/-/EJBOverHTTPTestCase/-/StatefulIncrementorBean', method=POST, protocol=HTTP/1.1}
// change thread on marshaling ue to use of XnioWorker.execute()
10:13:26,555 INFO  [org.wildfly.httpclient.ejb] (XNIO-1 task-3) HttpEJBReceiver: createSession:HttpMarshaller - thread = XNIO-1 task-3
10:13:26,573 INFO  [org.wildfly.httpclient.ejb] (XNIO-1 task-3) HttpEJBReceiver: writing transaction - type = 0
10:16:25,115 INFO  [org.wildfly.httpclient.common] (XNIO-1 I/O-1) HttpTargetContext: clientReceiveCallback:failed - thread = XNIO-1 I/O-1
10:16:25,120 INFO  [org.jboss.as.test.clustering.cluster.AbstractClusteringTestCase] (main) EJBOverHTTPTestCase : running after test 
10:16:25,120 INFO  [org.wildfly.httpclient.common] (XNIO-1 I/O-1) HttpTargetContext: clientReceiveCallback:failed - thread = XNIO-1 I/O-1
10:16:25,120 INFO  [org.wildfly.httpclient.common] (XNIO-1 I/O-1) HttpConnectionPool: returnConnection - thread = XNIO-1 I/O-1
10:16:25,120 INFO  [org.wildfly.httpclient.common] (XNIO-1 I/O-1) HttpConnectionPool: runPending - thread = XNIO-1 I/O-1